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Hello...Can Mac OS 10.11 run all versions of Creative Suite?
Are you referring to Creative Suite or Creative Cloud?
Creative Suite (CS6 should be okay). Creative Cloud, not a chance.
CC 2018 was the latest that would install and run on El Capitan. I was running it on an old Macbook Pro, but it was very sluggish and I pretty much abandoned as I bought a newer machine soon after. Not that it matters: the potential success of you installing CC 2018 now is pretty thin.
I found an old table that will show you which software was sold as Design Premium, Design Standard, Production Premium and Master collection, but note that for CS6 this was in 2012 and 2013. There is no reputable avenue to purchase these licenses now. If you are looking at eBay, etc, note that you may be purchasing non-genuine software with potential malware issues. We will not be able to help you if you go that route.